Just found this message in my mailbox:
We are pleased to announce that exclusively at Captain Sim online store, from 00:00 to 23:59 22DEC2011 (UTC) everything is Euro 9.99! Visit us at: http://www.captainsim.com Important: 24 hours only. At 23:59 22DEC2011(UTC) all prices are back to regular. All sales made during the sale event are equal to regular sales. If traffic exceeds our expectations some of our servers slowdown/outage is possible during the sale event.
Captain Sim News